Arm cast cover



FIG. 1 is a front end elevational view of an arm cast cover, showing my new design;

FIG. 2 is a top plan view thereof, the bottom plan view being identical;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof; and

FIG. 5 is a rear elevational view thereof. 

The ornamental design for an arm cast cover, as shown and described. 